Stoker construction



Dec. 29, 1936. R. l.. BEERS STOKER CONSTRUCTION WV""""\""'Mv Filed June 25, 1954 4 Sheets-Sheet l INVENTOR ECe '56ers I I I MTTORNEYS.

Dec. 29, 1936. R. L BEERS 2,065,555

STOKER CONSTRUCTION EiledrJune 25, 1934 4 Sheets-Shea?l 2 25 2|/ /jg/ EZU' www E a a E 25 E (2)4 i INVENTOR U Ce eers ATTOR Y,S

Dec. 29, 1936. R BEI-:R5

STOKER CONSTRUCTION Filed June 25, 1954 4 Sheets-Sheet 5 INVENTOR ATTORNEY Dec. 29, 193e. R. l.. BEERS 2,065,555

sToKER CONSTRUCTION Filed June 25, 1934 4 Sheets-Sheet 4 INVENTOR ATTORN fS Patented Dec. 29, 19136 UNITED STATES STOKER CONSTRUCTION Royce L. Beers, Detroit, Mich., assigner to Detroit Stoker Company, Detroit, Mich., a corporation of Michigan Application June 25, 1934, Serial No. 732,363

Claims.

This invention relates generally to stoker constructions and refers more particularly to improved cooling means for stokers of the type illustrated in my application Serial No. 637,186 led 5 October 10, 1932.

One of the essential objects of the invention is to provide the rotary impeller shaft and associated parts of the stoker with improved cooling means.

l() Another object is to provide a Stoker wherein the cooling medium is circulated within .and outside the rotary impeller shaft.

Another object is to provide a Stoker wherein the cooling medium is circulated within and l5 through the walls of the rotary impeller housing.

Another` object is to provide a stoker wherein the cooling medium is utilized after cooling the parts aforesaid to aid combustion and distribution of the une fuel projected by the rotary impeller into the furnace.

Other objects, advantages and novel details of construction of this invention will be made more apparent as this description proceeds, especially when considered in connection with the accompanying drawings, wherein:

Figure 1 is a fragmentary vertical sectional view taken substantially on the line i-l of Figure 2;

Figure 2 is a sectional View taken on the line 36 2 2 of Figure 1;

Figure 3 is a sectional View taken kon line 3 3 of Figure l, and in part diagrammatic;

Figure 4 is a sectional View taken substantially on line 6 4 of Figure 1 and with certain parts omitted;

Figure 5 is a detail rear elevation of the lowermost casting of the rotary impeller housing;

Figure 6 is a front elevation of the casting illustrated in Figure 5;

Figures 7, 8, 9 and 10 are sectional views taken on the lines 1 1, 8 8, 9 9 and Ill-l0, respectively, of Figure 6;

Figure 10A is a plan view of the casting shown in Figure 5;

Figure 11 is Aan end elevation of the casting illustrated in Figures 5 and 6;

Figure 12 is a rear elevation of the intermediate casting of the rotary impeller housing;

Figure 13 is a top plan View of the casting illustrated in Figure 12;

Figures 14 and 15 are'sectional views taken on the lines H ll and |5 |5 of Figure 12;

Figure 16 is an'endelevation of the casting illustrated in Figure 12;

Figure 17 is a front elevation of the uppermost casting of the rotary impeller housing;

Figure 18 is a top plan view of the casting illustrated in Figure 17;

Figure 19 is an end elevation of the casting il- 5 lustrated in Figure 17;

Figures 20 and 21 are sectional views taken on the lines 20 26 and ill-2l, respectively, of Figure 17;

Figure 22 is an elevation of one of the side 10 plate baies;

Figure 23 is a top plan view of the baille illustrated in Figure 22;

Figure 24 is an edge elevation of the baiile illustrated in Figure 22; 15

Figure 25 is a fragmentary detail View of the hollow rotor shaft;

Figure 26 is an end elevation of the shaft illustrated in Figure 25;

Figure 27 is another end elevation of the shaft 20 illustrated in Figure 25;

Figure 28 is a view somewhat similar to Figure l, but showing a slight modification.

Referring now to the drawings, A is the front plate attachable to the front of a suitable vfurnace 25 and having an opening l therein through which fuel may be projected into the furnace; and B is a base plate upon the outer side of the front plate and having an opening 2 therein registering with the opening l in the front plate. C and D 30 respectively, are side plates, E is a front cross plate, and F is a rear cross plate of the Stoker frame structure. G is the rotary impeller for projecting fuel through the registering openings 2 and l into the furnace, and H is the housing 35 for the rotary impeller. I is a fuel hopper supported upon the cross plates E and F of the frame structure. J is a fuel distributor plate extending beneath the hopper I and over the housing H, and K is a reciprocating ram on the plate J for ad- 40 vancing fuel from the hopper `over the plate onto the rotor G. Any suitable means such as an arm 3 xed to a rockshaft 4 operable by mechanism not shown may be utilized for reciprocating the ram K, while the adjusting screw 5 journaled in 45 the cover plate 6 and threadedly engaging a depending portion of the plate J may be employed for adjusting the latter over the housing H relative to the rotary impeller G. Racks 'l rigid with the plate J and engaging pinions 3 on a shaft 9 50 journaled in the sideplates C and Dare provided to adjustably support said plate J, as shown in my former Patent No. 2,020,871 of November 12, 1935.

Preferably the rotary impeller G comprises a tubular shaft I0 j our'naled in bearings Hand l2 55 respectively on the outer sides of the side plates C and D, a drum I3 sleeved upon and rigid with the shaft I0 between the side plates, and blades I4 fixed upon the periphery of the drum at substantially diametrically opposite points thereof. As shown in Figure 1, the drum I3 is provided at opposite ends with reduced portions I5 and I6 respectively which extend through suitable open-l ings in the side plates C and D and terminate upon the inner sides of the bearings II and I2. I1 is a sprocket wheel or driving element. fixed to the shaft upon the outer side of the bearing I2 and operable by suitable means (not shown) to effect the rotation of the rotary impeller.

Preferably the rotor housing H comprises three hollow castings I8, I9 and 20, respectively. The lowermost casting I8 extends across the front of the base plate B just below the opening 2 therein and is provided in its rear wall I8 at opposite ends thereof with inlets 2| for air. 22 are outlets for air in the top wall 23, while 24 are outlets vfor air in the front wall 25 of said casting. 26 are laterally spaced passages for air in the casting I9 and are arranged to receive air from the outlets 24 in the casting I8. 26' are passages for air at opposite ends of the casting I9 in communication with the passages 26 and extending through the casting to the upper edge thereof. Preferably the passages 26 extend through the casting I9 from the lower rear edge thereof to the upper forward edge thereof. 21 are passages in the uppermost casting 20 for receiving air from the passages 26 in the intermediate casting'l9. Preferably the passages 21 extend through the casting 20 from the lower edge thereof to its upper edge andare provided at said upper edge with rearwardly extending portions 28 through which the air may fiow into the rotor housing H above the rotor G. 29 are bale plates for the side plates C and D having semi-circular openings 30 receiving the rotor drum I3 and having passages 3| and 32 therein adapted to receive air from the outlets 22 in the casting I8 and the passages 26' in the casting I8. As shown, the passages 3I and 32 have common outlets 33 through which the air is adapted to flow into the furnace. Thus, air admitted to the lowermost casting I8 flows through the castings I9 and 20 and is discharged through the outlets 28, and also flows to the defiector plates 29 and is discharged through the openings 33 into the furnace.

34 are upright air ducts upon the inner side of the front plate A and adapted to receive air under pressure from beneath the dead plate 35. 36 and 31 respectively are aligned openings in the ducts 34 and plate A for conducting air from the ducts to the air inlets 2| of the casting I8 of the rotor housing, and 38 is a downwardly and rearwardly extending apron upon the inner side of the front plate A just beneath the opening I and having passages 39 adapted to receive air from the ducts 34. Y

In the present instance, air is also used as a cooling medium inside and outside the rotary impeller shaft I0. As shown, 4I) is suitable piping extending from the opening 31 in the plate A to one end of the shaft I0, 4I is a closuremember within the shaft I0 adjacent its other end, and 42 are openings in the shaft I0 adjacent the closure member 4I. By referring to Figure 1, it willbeobserved that a space 43 is provided about the shaft III within the drum I3 and that passages 44 and 45 respectively for air are provided in the drum at opposite ends thereof. Thus, air from the ducts 34 may flow through the piping 40 inside the pipe I0 through the openings 42 into the space 43, thence through the passages 44 and 45 to the interior of the rotary impeller housing H. In this connection it will be observed 5 that portions 46 of the passages 44 extend to the bearings II and I2, hence the latter are also cooled.

In Figure 28 I have shown a slight modification where water is used as the cooling medium. As shown, water is conducted from a suitable source through the inlet pipe 50 to the inside of rotary impeller shaft 5I. 52 is a closure member Within the shaft 5| opposite the outlet end Y53 of the pipe 50, 54 is a wheel or slinger fixed to the shaft 5I within a casing or receiver 55 and having an opening 56 receiving the pipe 50 and `through which water may flow from inside the shaft 5I to the receiver-55, and 51 is an outlet pipe for the receiver 55. Thus, with this construction the water is supplied to the inside of the rotary impeller shaft 5I by the pipe 50 and passes to the left-hand end of the shaft where it is blocked by the closure member 52. The water then returns around the pipe 50 within the shaft 5I to the opening 56 where it is thrown into the receiver 55 by the slinger 54. Thus the slinger 54 acts as a pump for forcing circulation of the water. Otherwise, the construction may be the same as that illustrated in Figure 1.

What I claim as my invention is:

1. A stoker comprising a horizontal rotary impeller, a cylindrical housing therefor having an opening therein for receiving fuel and discharging the same into the furnace, said housing having hollow walls and formed of a plurality'of adjoining sections, the lowermost section having a passage extending therethrough parallel to the axis of the impeller and provided with one or more ports for the entrance of air thereinto, said sections having registering ports for delivering air from one to another and the uppermost section being adapted to discharge air from its upper side.

2. In a stoker, the combination with a horizontal rotary impeller, of a cylindrical housing therefor having an opening therein for receiving fuel and discharging the same into the furnace. said housing formed of a plurality of adjoining cylinder segments, the lowermost segment having an air passage extending therethrough parallel to the axis of the impeller and being provided with one or more ports for the`entrance of air thereinto and the other segments being provided with a plurality of circumferentially extending passages in the walls thereof, said passages registering with those of the adjacent segments and the uppermost segment having a port or ports connecting with' all of the channels thereof for delivering air into the interior of the housing. x

3. In a Stoker, the combination with a horizontal rotary impeller, of a cylindrical housing therefor having an opening therein for receiving fuel and discharging the same into the furnace, said housing comprising a series of adjoining cylinder segments and end walls, the lowermost of said cylinder segments being provided with a passage extending therethrough parallel to the, axis of the impeller and having one or more ports 70 for the entrance oi air thereinto, the other segment having a plurality of parallel circumferentiaily extending air passages registering with those of the adjacent segment, and the uppermost segment having at its upper portion a pas- 15 housing, linings spaced from said end walls withY the lower portions of the spaces connecting with the air passage of the lowermost segment, and Y their upper portions having air discharge ports,v 4. In a stoker, the combination with a shari.

zontal rotary impeller, of a cylindrical hoilsiiig,fv therefor having an opening therein for receivingl fuel and discharging the same into the furnace. said housing comprising a plurality of adjoining cylinder segments, end walls and liner plates for said end walls spaced therefrom to iorm air passages therebetween, the lowermost of said cylinder segments being provided with a passageextending therethrough parallel to the axis of the impeller and provided with one or more ports for receiving air thereinto, the other segments being formed with a plurality of parallel circumferentially extending air passages registering with air passages in the adjacent segments, and the uppermost segment having a discharge port in its upper portion for the passage of air into the interior of the housing, the spaces between said end walls and liners being connected with the air passage in said iowermost segment and having discharge ports in their upper portions.

5. In a stoker, a horizontal rotary impeller including arhollow drum with impeller blades extending radially therefrom, a cylindrical housingfor said impeller having an opening therein forreceiving fuel and discharging the same into thefurnace. said housing provided with hollow walls with continuous passages extending circumferentially thereof and with linings spaced from the end walls forming passages extending upwardly therethrough, said housing being further provided with one or more air ports at its lower end for the entrance of air thereinto and with a passage extending parallel tothe axis of the impeller in the lower portion oi the housing, said passage being connected with the lower ends of all of said circumferentially extending passages and also with the lower ends of the passages between said linings and end walls, and means for passing a cooling medium through the hollow drum of said impeller.

` ROYCE L. BEERS. 

